JPH0431596A - Tail clearance measuring device - Google Patents

Abstract

PURPOSE:To permit tail clearances to be measured at any time by a method in which data measured by using a wedge part having a position sensor set on contact face with a segment attached to the tip of the jack of a shield excavator are calculated by a specific formula. CONSTITUTION:A propulsive jack 5 is set to ON and when a wedge-like part 12 is contacted with an existing segment 6, a pressure is applied to one point of the contact face of the segment 6. The segment 120 thereunder is reacted to send out signals which are in turn sent from a signaler 124 to a clearance measurer 9. Since the distance of the portion P is known by the position sensor 120, the length X=K-pcosalpha is calculated. Tail clearance X-b=K-pcosalpha-b is then obtained, and the distance L between the outer wall of the segment 6 and the soil wall 11, L=X+a-b=K-pcosalpha+a-b, is calculated. The tail clearance can thus be simply measured.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a tail clearance measuring device installed inside a shield excavator that excavates a tunnel using a shield method.

<Prior Art> Generally, excavation by a shield excavator was performed using a mechanism as shown in Fig. 4. FIG. 4 is a cross-sectional view of the construction of an example of a shield tunneling machine. In FIG. 4, numeral 1 denotes a cylindrical shield tunneling machine main body, which moves forward while excavating an earth and sand section 10.

2 is a cutter head that excavates the disk-shaped earth and sand area;
3 is a tail portion which becomes the cylindrical portion of the shield tunneling machine main body 1;
Excavated earth and sand is taken into the shield excavation a1 by a screw conveyor 41 disposed inside, and is conveyed by a conveyor in the excavator (not shown). 5 is cutter head 2
A propulsion jack 6 is a segment assembled into a cylindrical shape along the inner wall of the excavated tunnel. A plurality of propulsion gears 5 are provided on the end face of a segment 61 assembled at the end of the inner wall of the tunnel, and obtain propulsion force by pushing the segment 6. 7 each time segment 6 is assembled -
- It is a milk solid material that hardens between each segment and the earthen wall 11.

Here, the operation of this conventional shield tunneling machine will be explained.

The excavation path of this shield excavator 1 is pre-programmed from the management computer, but the direction is determined using a gyro compass and a Javel (not shown).
Analyze the level and excavate while correcting any errors with the target line. First, excavate the earth and sand part 10 with the cutter head 2,
The excavated earth and sand is taken into the shield excavator 1 through a screw conveyor 41 in the earth and sand discharge device 4, and is conveyed to the outside by a conveyor (not shown). As the shield tunneling machine 1 excavates, the segments 6 are assembled into a cylindrical shape, and the propulsion jack 5 pushes the segment 1-6 in the direction of arrow A, thereby obtaining the propulsion force of the shield tunneling machine 1. A plurality of these propulsion jacks 5 are provided on the circumference formed by the segment -.
The course of the shield tunneling machine 1 can be changed by selectively increasing or decreasing the pushing force of the propulsion jack 5. After assembling six segments 6 in a somewhat continuous manner, all the segments on the same ring A hole is made near the center, a nipple material is poured in, and the segment 6 and wall 11 are fixed. At this time, if you inject the milk solid material after the segments have been silken, it may land on the tail part 3, so make sure there is a sufficient distance between the segment where the milk solid material is injected and the tail part. Is required.

This operation is repeated as described above, and the excavation is continued in a predetermined direction while making corrections as needed.

Here, if the course of the shield tunneling machine 1 is curved, the clearance (tail clearance) between the inner wall of the tail part 3 and the outer wall of the segment 6 will be reduced by #1, thereby changing the position of the segment and the milk solid material. Therefore, measuring the tail clearance is a very important factor.

Next, an example of a conventional clearance measuring device will be shown.

FIG. 5 is a sectional view showing an example of a conventional clearance measuring device. Components that are the same as those in FIG. 4 are given the same numbers and their explanations will be omitted. The same applies to subsequent figures. 8 is a steel tail clearance sensor that measures the distance between the segment outer wall and the earth wall 11 based on the amount of deflection of the steel. 29 is a steel tail clearance sensor that measures the amount of deflection of the steel tail clearance sensor 8. This is a clearance measuring device that detects with a corner gauge and converts it into a clearance amount. Here, this clearance measuring device measures the distance between the outer wall of the segment 1 and the earthen wall 11, and from the measured value and the thickness a of the tail part 3 of the shield excavator 1, L - a
By calculating , the distance between the outer wall of the segment and the inner wall of the tail portion 3 could be determined. Moreover, the measured value of this tail clearance determined the amount of milk solid material to be poured between the segment 1-6 and the earthen wall 11.

<Problem to be solved by the invention> In general, the tail clearance can also be used as reference data for the amount of milk solid material, but by knowing the distance between the inner wall of the sol and the outer wall of the segment, it is possible to This prevents parts from colliding. However, in the above-mentioned conventional tail clearance measuring device, since the measurement is performed at the time of assembling segment 1 after excavation, there is a problem that the distance during excavation cannot be measured. Therefore, when excavating after assembling segments 1 to 1, there is a possibility that the tail portion and the segments will collide and be damaged.

The present invention was made to solve such problems, and an object of the present invention is to provide a tail clearance measuring device that can measure tail clearance during excavation.

Means for Solving the Problems> The present invention is a tail clearance measuring device having the following configuration.

In a tail clearance measuring device that measures a tail clearance formed between an outer wall of a segment assembled along an inner wall of a tunnel excavated by a shield excavator and an inner wall of a tail portion of the shield excavator, one side is A wedge-shaped member that contacts the tail part and is installed so that its oblique side touches the segment; a position sensor that is arranged on the oblique side of this wedge-shaped member; and a signal from this position sensor is input, and the wedge-shaped member contacts the segment. The present invention is characterized by comprising a calculation means for calculating a tail clearance, which identifies a position where the tail clearance is located, and performs a predetermined calculation.

Further, the calculation means is characterized in that it calculates the tail clearance TL by calculating the following equation.

TL=ni-pcosα+a-b However, k:I! Length of the side perpendicular to the tail of the wedge-shaped member, p: Distance from the vertex that does not touch the tail of the wedge-shaped member to the contact point of the segment, α: The distance between the side perpendicular to the tail of the wedge-shaped member and the hypotenuse angle, a: thickness of the tail portion, b=height from the point of contact between the wedge-shaped member and the segment to the outer wall of the segment.

In the present invention, a wedge-shaped member with a position sensor attached to the oblique side opposite to the excavation direction is attached to the tip of a jack for pushing an existing segment, and the wedge-shaped member is pressed against the segment. Calculate the tail clearance geometrically by identifying the pressed position sensor.

<Example> The present invention will be described in detail below using the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of a tail clearance measuring device according to the present invention. This shows the tail clearance measuring device inside the shield tunneling machine, so we will omit an explanation of the operation of the shield tunneling machine, and assume that the shield tunneling machine itself operates in the same way as the shield tunneling machine shown in Figure 4. do.

In the figure, 12 is a wedge-shaped member attached to the tip of the propulsion jack 5, and a position sensor 120 is attached to the oblique side on the opposite side to the digging direction. This position sensor 120 operates as a sensor at the point of contact with the segment 6, and based on the position signal, a clearance measuring device 9, which is a calculating means, calculates the tail clearance, and a computer (not shown) calculates the tail clearance according to the calculated value. Performs predetermined processing and control.

Fig. 2 shows a specific configuration example of a position sensor. Fig. 2 is a diagram showing an example of a position sensor arranged on a wedge-shaped member. In Fig. made of rubber. Reference numeral 122 designates a printed circuit board, on which conductor portions 123 serving as sensors are arranged in the direction of the oblique side.

Reference numeral 124 is a signal line, and when the segment applies pressure in the direction of arrow B in the figure, the conductor section located below the pressure point emits a position signal, which is sent to the clearance measuring device 9 via this signal line 124 for calculation. be done.

Next, the present invention will be explained in detail using FIGS. 1 to 3. FIG. 3 is a diagram showing the main parts of the wedge-shaped member. First, the propulsion jack 5 is turned on to bring the wedge-shaped member 12 into contact with the existing segment 6. At this time, pressure is applied to one point on the segment contact surface shown in FIG. 3, and the sensor located below reacts and outputs a signal, which is sent to the clearance measuring device 9 through the signal line 124. At this time, since the distance of part p is known by the position sensor in Fig. 3, if the length of one side perpendicular to the tail of the wedge-shaped member 12 is K, and the angle between this side and the oblique side is α, then the clearance The length of X in the figure is calculated by the arithmetic unit of the measuring device 9 as follows: x=-pcosα. Further, if the thickness of the tail portion 3 is a, and the height from the contact point of the segment 6 to the inner wall is b (these are known values), the tail clearance is x-b = -PC
O8 (Z-b) The distance between the outer wall of segment 6 and the earthen wall 11 is L=x+a-b=-pcosα+a-b.After this, this calculated value is sent to the management computer (not shown). The information is then sent and subjected to predetermined processing and control.

In this way, the tail clearance can be measured geometrically and easily using a position sensor6.In addition to simply making contact between the wedge-shaped member and the propulsion jack, A flexible joint may be used to make the wedge-shaped member movable.

<Effects of the Invention> As explained in detail above, in the present invention, a wedge-shaped member is used in which a position sensor is disposed on the contact surface of the tip of the jack and the segment. Because the tail clearance can be easily calculated, the tail clearance can be measured at any time while digging. In addition, since it is connected to a computer and can be measured online, it is possible to measure the clearance width during straight and curved excavation, eliminating the need to stop during excavation to take measurements, making it possible to assemble optimal segments. Furthermore, unlike the conventional method of using steel, measurements can be taken without contacting the earthen wall, so it is inexpensive and allows measurements to be taken without affecting water submergence due to rolling of an excavator, etc. I can do it. Furthermore, depending on the measured tail clearance distance or the distance between the segment and the earth wall, it is possible to suppress the operation of the shield excavator and adjust the milk solid material to prevent damage to the shield machine and to adjust the milk solid material. It is possible to prevent excessive injection of material.

[Brief explanation of the drawing]

Figure 1 shows the tail clearance measuring device according to the present invention! of-
・A configuration sectional view showing an example; FIG. 2 is a diagram showing an example of the configuration of a position sensor; FIG. 3 is a diagram showing the main part of a wedge-shaped member;
FIG. 5 is a cross-sectional view showing an example of a conventional shield tunneling machine, and FIG. 5 is a cross-sectional view showing an example of a conventional clearance measuring device. 1st section 1...Shield excavation @3...Tail portion 5...Propulsion jack 6...Segment 9...Clearance measuring device 1...Earth wall 2...Wedge-shaped member 20...・Position sensor ]21...Segment contact surface 22...Printed circuit board 123...Conductor #24...
Signal line diagram 2

Claims (2)

[Claims] (1) In a tail clearance measuring device that measures the tail clearance formed between the outer wall of a segment assembled along the inner wall of a tunnel excavated by a shield excavator and the inner wall of the tail portion of the shield excavator, a wedge-shaped member installed such that one side contacts the tail portion and the oblique side contacts the segment; a position sensor arranged on the oblique side of the wedge-shaped member; inputting a signal from the position sensor; A tail clearance measuring device comprising a calculation means for calculating a tail clearance by identifying a position in contact with a segment and performing a predetermined calculation. (2) The tail clearance measuring device according to claim 1, wherein the calculation means calculates the tail clearance TL by calculating the following equation. T_L=K-pcosα+a-b where, k: Length of the side perpendicular to the tail of the wedge-shaped member, p: Distance from the vertex that does not touch the tail of the wedge-shaped member to the contact point of the segment, α: Wedge-shaped member The angle formed by the side perpendicular to the tail and the oblique side, a: Thickness of the tail, b: Height from the point of contact between the wedge-shaped member and the segment to the outer wall of the segment.